（）What is the target audience
A. Computer users who do not know much about the technical means of cybercrime prevention
B. Software vendors who can help users deal with security and privacy settings
Computer users armed with some technical advice and common sense
D. Online criminals who take advantage of software flaws
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（）What is the purpose of this audio clip
A. To persuade
B. To inform
C. To instruct
D. To describe
（）What is the conversation mainly about
A lesson Matthew prepared for his students
B. A class Matthew has been observing
C. A term paper that Matthew has written
D. A problem in Matthew’s classroom
（）What can you predict when you hear the professor asking about the student’s observing a class for his approaches to education paper
A. They will probably talk about his understanding of effective teaching skills
B. They will probably talk about how to improve his study habits
C. They will probably talk about his language learning strategies
D. They will probably talk about his student loans
Which of the following expressions don’t mean “延误会有多久”（）
A. What’s the extent of the delay
B. How often is the delay last
C. When’s the delay
D. How long will the delay be
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